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| Japan 1 2 3 4 5 6 |
| Sponsor Companies | ||||
| Name | Installation Staff | Starting Date |
Installed kWp/2010 kWp/2009 |
Countries Operating In |
| YAMAKI KOGYO | Japan | |||
| Yamato Bankin | Japan | |||
| Yamatodenki | Japan | |||
| Yamazaki | Japan | |||
| Yanegiken T&R Institute | ||||
| YKK AP | Japan | |||
| Yokogawa System | China | |||
| Yokohama Kankyol Design | 15 | Japan | ||
| Yokota pipe Industrial | 15 | Japan | ||
| Yoshi San | 35 | Japan | ||
| Yoshinaga | 1997 | Japan | ||
| Youkido Create Industry | 21 | Japan | ||
| Yurtec | 3,783 | |||
| Yuukikaku | 11 | Japan | ||
| Z-tec Home Service | Japan | |||
| Zosho | 37 | Japan | ||
| ZUODENKI | Japan | |||
| 1 2 3 4 5 6 | ||||